Correct Answer: C

Rationale: The correct answer is C: 'Use of accessory muscles.' In a client with COPD and pneumonia, the use of accessory muscles indicates increased work of breathing. This finding is concerning as it may signal respiratory failure, requiring immediate intervention. Oxygen saturation of 90% (choice A) is low but not as immediately concerning as the increased work of breathing. A respiratory rate of 24 breaths per minute (choice B) is slightly elevated but not as critical as the use of accessory muscles. Inspiratory crackles (choice D) may be present in pneumonia but are not as indicative of impending respiratory failure as the increased work of breathing shown by the use of accessory muscles.

Correct Answer: D

Rationale: In Paget's disease, bone remodeling is affected, leading to increased risk for fractures. Therefore, the primary goal of client teaching should focus on reducing the risk for injury. Choices A and B are not directly related to the primary concern of Paget's disease, which is bone fractures. Choice C, promoting rest and sleep, is important for overall health but is not the priority when considering the specific risks associated with Paget's disease.

Correct Answer: B

Rationale: Heart disease can affect growth, leading to smaller size in children.

Correct Answer: C

Rationale: A serum potassium level of 5.5 mEq/L should be closely monitored in a client with chronic heart failure as it may indicate hyperkalemia, requiring intervention. Hyperkalemia can lead to life-threatening cardiac arrhythmias in patients with heart failure. Serum creatinine (Choice A) is important to monitor for kidney function but is not the priority in this case. Serum sodium (Choice B) and blood glucose (Choice D) levels are not typically the primary focus when assessing a client with heart failure presenting with respiratory symptoms and crackles in the lungs.

Correct Answer: A

Rationale: The correct answer is A. Frequent use of magnesium-containing laxatives can lead to hypermagnesemia, particularly in elderly clients. Option B, dietary intake of magnesium-rich foods, may contribute to elevated serum magnesium levels but is less likely the cause in this scenario. Option C, the use of magnesium-containing supplements, can also contribute to hypermagnesemia but is not as common in elderly clients without a history of using such supplements. Option D, history of alcohol use, is less relevant to the development of elevated serum magnesium levels compared to laxative use for chronic constipation.